xc2bit: Make reftests take a round-trip through crbit
xc2bit: Make reftests take a round-trip through crbit

This at least exercises the crbit codepaths

rqou/openfpga,azonenberg/openfpga,rqou/openfpga,azonenberg/openfpga,azonenberg/openfpga,azonenberg/openfpga,azonenberg/openfpga,rqou/openfpga,rqou/openfpga,rqou/openfpga